中国电机工程学报2026，Vol.46Issue(11)：4377-4388,中插2,13.DOI:10.13334/j.0258-8013.pcsee.250714
含T接逆变电源的配电线路自适应纵联阻抗保护
Adaptive Impedance-based Pilot Protection for Distribution Lines With T-connected Inverter Based Resources
摘要
Abstract
In distribution systems with T-connected inverter-based resources(IBRs),differences in control strategies between grid-following and grid-forming IBRs lead to multi-source coupled nonlinear fault current characteristics,potentially causing maloperation or failure of conventional protection schemes.An adaptive pilot impedance protection method,based on equivalent IBR sequence impedance phase angle intervals,is proposed.The phase angle difference intervals between the point of common coupling voltage and positive-sequence output currents of both types of IBRs are quantified according to their fault ride-through control strategies.Impedance characteristics of IBRs in the negative-sequence network are analyzed,and equivalent sequence impedance phase angle intervals for different IBRs are unified in sequence networks to decouple fault characteristics from source-side control dynamics.Consequently,an adaptive positive-sequence impedance protection criterion is constructed based on the phase angle difference between the estimated T-node voltage and differential current.For asymmetric high-resistance faults,this paper proposes an additional protection criterion,which combines the accumulation and polarity product of negative-sequence impedance phase angles,to enhance resistance to transition resistance.Simulation results show that the proposed protection scheme can identify faults within 8 ms,withstand 500 Ω high-resistance faults eliminate the need for sampling data synchronization,and remain unaffected by the type and capacity of IBR.关键词
配电系统/分布式电源/构网型/跟网型/纵联阻抗保护Key words
distribution system/inverter based resource(IBR)/grid-forming(GFM)/grid-following(GFL)/pilot impedance protection分类
信息技术与安全科学引用本文复制引用
李猛,杜晓通,和敬涵,卫殿文,王昊月..含T接逆变电源的配电线路自适应纵联阻抗保护[J].中国电机工程学报,2026,46(11):4377-4388,中插2,13.基金项目
国家自然科学基金项目(U23B6007).Project Supported by National Natural Science Foundation of China(U23B6007). （U23B6007）
